Blast torch perforated combustion burner



Patented Nov. 30, 1948 UNr-I'IEDy STATES artsen BLAST TORCH lPERFORATED COMBUSTION BURNER Samuel C. Brody, Newton, `Mass.k

Application Julyv23, 1947, Serial No. 762,970

2 Claims.

This invention relates to-a novel combustion burner to bev used with an automatic pressure generating unit of the self-generating type.

One object of my invention is to provide a burner which is so constructed as to greatly intensify theV conduction of heat to the pressure generating tube, sometimes called*y a wick tube or ,gooseneckjr onwhich the burner is operatively assembled.

Anotherobjectis to provide a burner which is so constructed as to prevent leakage ofv gas' or other pressures Apast the joining faces between the burner and the operating assembly of the pressure generating tube.

A further object of my invention is to provide a combustion burner that. will generate a greater proportion. of heat and a far more intense blast ame for a given diameter than Washeret'ofore possible.

A still further object of. my invention is to. provide a burner so constructed as to furnish. the means for constantly increasing combustion thereinso that the blast flame emitting therefrom may quickly reach its maximum force and' heat intensity in proportionto the diameter and construction of the. burner and to retainand continue to generate such maximum forcev and blast flame until all the fuel` has been exhausted or. until the torch. has been. extinguished.

In. attaining. my objects, Lmakethe .Wa-1l thick.- ness of. the burner atits gasintake end, and run. ning. thelength. of. its operating assembly joining portionseveral times greater than the wall thickness of the combustion chamber of .the burner which. represents that. portion. extending beyond the short. assembly joining portion at the intake end of. the burner. Thus, when the face of the combustion burner at its gas intake end is securely This burner is constructed in such :a manner that the operating assemblyv of the pressure generating tube. extends for a suitable length into the gas intake end of the burner so that theinstant the gas, reaches and passesthrough the thickened and superheated wall portion. at the gasintake.- endof. the burner it becomes-intensely superevoletilized; and. suddehzlu expands .in-to. the.

(Cl. S-33),

2 combustion chamber `of the said'burner` and mixes with the air therein; to provide ideal combustion, thus putting great force behind the blast flame emitting therefrom. 5 Thev elements that-bring about 'this intense superr volatilizationof the gases are the large diametersy .of the butting faces of theburner and the operative assembly of the pressure generating tube and the thickened Wall portion of the gas intake-endof the burner, bothzof which combine with each other. for ideal and maximum heat conductionl at the critical assembly point, just prior tothe point where the gas enters into th combustion chamber of the burner;

In the combustion bur-ners used heretofore the wall thicknessiof the inside diameter was'generallyv uniform throughout. In myv burner, the greatly `thickened gas intake endprovides for the maximum conduction of heat 'tothe point where it ismost needed to provide maximum super heating' ofthe gases when passing through that area fory the purpose of'prom'oting ideal combustion. The connection presently used between the pressure generating tube and the combustion burner-is the jet unit covered by.l my prior Patent No. 2,102,404', but in whichthe gas expansion chambers vare tapered toepromote accelerated gas expansion.

As a result of the aforestated construction, it will; be noted that-'during the period when the combustion burner is approaching or reaches its maximum blast flame for-ce and intensity, the force'and;-intensityofv the blast name is such as to prevent to a very substantial Vdegreethe heat conductivity loss; now apparent in the yconventional .type burner. l v

.Other obiectsand-advantages will appear as this descriptionfproceeds.

Ina the aQQQmhan-ying drawing wherein'I haveshown a preferred embodimentoi my invention:

Fig,- 1v is; an `enlarged section through my burner showing itiini operative position upon a portion ofi-,a pressure generatingtube.

assembled. thereto.

Figz. 3 is. a -view showing my burnerapplied tov a torch; of. conventional type, and

endfotheiburner, withthe lcoupling unit omitted.

Although not restricted to such use, my burner Fig? 2is;,a perspective view at the gas intake end ofthe burnenaiid` showing the coupling unit Fig. l is; a `perspective View: at the'gas intaketively connects the burner and the pressure generating tube to one another and provides a continuous and unbroken path for the conduction of heat from the burner to a point well back of the jet orifice of the plug.

I have indicated generally at I my novel burner. It consists of a tube perforated as at II and provided at its inner end with a thickened wall portion, which may be an internal sleeve or tubular insert or flange I2 of metal or other suitablev material of high heat conductivity.

The outer face of the insert or flange I2 provides a tight sealing and continuous high heat conducting and retaining surface by which the heat conduction and retention is increased until the blast flame emitted from the combustion chamber I3 of the burner reaches: its maximum force and heat intensity. r

Sleeve I2 may be permanently assembled within the burner tube in any desired manner, as by pressing or otherwise. It may? be of any desired thickness and length but preferably is of avthickness and length to provide at the gas intake end of the burner a pre-heating zone or area of greater thickness, and providing greater heat retaining properties, than the combustion chamber of the burner which is of a considerably reduced-wall thickness.

Insert I2 is preferably internally threaded as at Il to enable the burner tobe removably assembled to the outer end of the pressure general:-v ing tube assembly I5, but I may provide other means for removably assembling the burner to the said tube. i

As shown the burner is assembled to the tube I5 by means of the jet unit I6. It`comprises a central sealing collar I 'I which is faced off as a hexagonal or other shaped nut and has two flat faces, one of which abuts the face at the outer end of the pressure generating tube and the other of which abuts the face of the burner and the insert I2 at its intake' end. The iet unit is provided with 'a iet orice I8 extending centrally therethrough. At either side of collar 'I'I are tubular extension `Iand 20, which provide separate tapered chambers 2| and 22 rcommunicating with each other through orifice I8 and with the adjacent ends of the tube I5 and burner I 0 respectively. ExtensionsA I9 and 20 are preferably externally threaded as at 23and 24 to cooperate, resepectively, and preferably, with 'an internal series of threads 25 on the adjacentjend of the' tube I5 and the internal series of threads I4 on the insert I2 of the burner.

The gas intake end of tube I5 may be assembled with any suitable pressure generating unit,`such asshcwn at 21 in Fig. 3, and the tube maybe provided with any suitable wicking or other capillary means, in this instance designated as at 28.

Preferably the burner I0 is of an outside diameter at its gas intake end atleast sufficiently greater than the overall diameter of the sealing collar I1 to substantially or completely overlap said face v(see Fig. 2). This insures a vpositive tightness of seal between the face ofthe gas intake end of the burner and the adjacent face of the collar I 'I which effectively prevents leakage ofgas or other pressures or any appreciable loss of heat `past the attaching means which connect the burner to the tube assembly I5, thus assuring maximum heat conductivity ba'ck to the pressure generating unit.

With this type of construction not only are the attaching means tightened up and abutted 4 against each other but also the aforesaid faces are tightly abutted against each other, thus creating an assembly Where two separate means of tightening cooperative with each other to establish a most secure double seal action.

Another advantage of my present burner is that the insert I 2 increases the thickness of the burner at its gas intake end where it overlaps the threaded portion of the jet unit, and thereby provides a greater amount of metal in this region yof the torch for absorbing and retaining heat from the burner when the torch is operating and for conducting the heat to the pressure generating unit and also to the Wall of the fuel casing, thus greatly increasing the efficiency of vaporization of the fuel and insuring a greater volume and a more perfect combustion of the gases within the combustion chamber of the burner.

The unique construction as embodied in my combustion burner lends itself to making combustion burners of much larger diameters than was heretofore possible that will successfully and efficiently operate whenused in connection with pressure generating units.

It will further be noted that I am able to use a burner tube of uniform thickness throughout its extent while at the same time obtaining the benefit of greater heat conductivity at the gas inlet end of the burner tube, due to the increased thickness of the metal at this area provided by the insert I2.

It isto be especially noted that my novel arrangement of the. insert or flange I2 provides a continuous balanced heat conductivity that is substantially uniform throughout the length of the combustion burner when operating. By the foregoing arrangement the thickened Wall construction .of the said insert acts as a heat accumulator and retainer and thus as the discharge end of the burner reaches its maximum temperature its heat is carried back continuously to and is absorbed and continuously retained by said insert. This procedure insures that the gas intake end of the burner remains substantially as hot asits dis-charge end, thus giving uniform heat throughout the length of said burner and insuring that the burner will continue to fire a uniform forceful and intensive blast flame. YIn the conventional type of combustionburners, the remote intake end which is substantially of the same wall thickness as the discharge end cools off much quicker and retainsfar less heat than the discharge end of the said burner when operating. Thus it has not been possible heretofore with the conventional type of combustion burners to obtain a balanced and uniform heat throughout the length of the said burnergwhen operating, such as I obtain with my novel type of combustion burner.

It is to bey understood that various modificationsof myvinvention may be made within the scope thereof as defined by the appended claims.

I claim: l v y i. In combination, a pressure generating unit, a perforatedy combustion burner, and a jet unit for coupling the discharge end of said pressure generating unit to the gas intake end of said burner, said burner having Within its gas intake end an elongated tubular heat conducting portion of substantial thickness as compared with the thickness of the burner wall and said heat conducting portion having a transverse end face disposed substantially flush with the transverse end face of the gas intake end of the burner and also having an axial-opening of relatively small diam- 6 2. The combination of claim 1 wherein the diameter of the transverse end face of said heat conducting portion is substantially equal to that of the face of the sealing collar with which it abuts.

SAMUEL C. BRODY.

No references cited. 

